September weather forecast
Saint Ann's Bay, Jamaica

September brings a slight relief from the soaring temperatures of previous months as it drops to 29.5°C (85.1°F) in Saint Ann's Bay. Despite the marginal reprieve in temperature, the rainfall hits its peak, making it the wettest month of the year. Coinciding with this, sea temperatures and daylight hours follow the preceding trend, adding yet another dimension to the city's weather complexities. Hence, September showcases the diversity in Saint Ann's Bay's tropical climate, impulsively switching between heat, humidity, and rain.

Temperature

September in Saint Ann's Bay experiences an average high-temperature of a still warm 29.5°C (85.1°F), barely different from August's 29.7°C (85.5°F). Saint Ann's Bay observes a consistent average low-temperature of 26.3°C (79.3°F) throughout September nights.

Heat index

September's average heat index is evaluated at a very hot 36°C (96.8°F). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.
The heat index's values are generally associated with conditions in shade and light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

The average relative humidity in September in Saint Ann's Bay is 78%.

Rainfall

In Saint Ann's Bay, in September, during 19.2 rainfall days, 94mm (3.7") of precipitation is typically accumulated. Throughout the year, in Saint Ann's Bay, there are 217.3 rainfall days, and 649mm (25.55") of precipitation is accumulated.

Sea temperature

August and September, with an average sea temperature of 29.8°C (85.6°F), are months with the warmest seawater in Saint Ann's Bay.
Note: Water temperatures in the range of 25°C (77°F) to 29°C (84.2°F) are warm and delightful, ensuring comfort during water activities over extended periods.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of the month, sunrise is at 05:54 and sunset at 18:22. On the last day of September, sunrise is at 05:59 and sunset at 17:57 EST.

Sunshine

In Saint Ann's Bay, the average sunshine in September is 11.1h.

UV index

The months with the highest UV index in Saint Ann's Bay are April through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In September, the UV index of 7 transforms into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Watch out! Reflections from sand and water can surge UV radiation exposure.